25 files changed, 455 insertions, 92 deletions
diff --git a/.travis.yml b/.travis.yml
index 2fd3bf991..6dde5b62b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: cpp
 compiler: clang
 
 before_install:
-  - if [ "$TRAVIS_MCSERVER_BUILD_TYPE" == "COVERAGE" ]; then sudo pip install cpp_coveralls; fi
+#  - if [ "$TRAVIS_MCSERVER_BUILD_TYPE" == "COVERAGE" ]; then sudo pip install cpp_coveralls; fi
 
   # g++4.8
   - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
@@ -21,17 +21,17 @@ install:
 # Build MCServer
 script: ./CIbuild.sh
 
-after_success:
-  - ./uploadCoverage.sh
+#after_success:
+#  - ./uploadCoverage.sh
 
 env:
   - TRAVIS_MCSERVER_BUILD_TYPE=RELEASE MCSERVER_PATH=./MCServer
   - TRAVIS_MCSERVER_BUILD_TYPE=DEBUG   MCSERVER_PATH=./MCServer_debug
 
-matrix:
-  include:
-    - compiler: gcc
-      env: TRAVIS_MCSERVER_BUILD_TYPE=COVERAGE   MCSERVER_PATH=./MCServer
+#matrix:
+#  include:
+#    - compiler: gcc
+#      env: TRAVIS_MCSERVER_BUILD_TYPE=COVERAGE   MCSERVER_PATH=./MCServer
 
 # Notification Settings
 notifications:
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index a25c6f06b..21654428f 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -7,6 +7,7 @@ Diusrex
 Duralex
 FakeTruth (founder)
 Howaner
+jasperarmstrong
 keyboard
 Lapayo
 Luksor
diff --git a/MCServer/Plugins/APIDump/Hooks/OnEntityChangeWorld.lua b/MCServer/Plugins/APIDump/Hooks/OnEntityChangeWorld.lua
new file mode 100644
index 000000000..25072ca5c
--- /dev/null
+++ b/MCServer/Plugins/APIDump/Hooks/OnEntityChangeWorld.lua
@@ -0,0 +1,29 @@
+return
+{
+	HOOK_ENTITY_CHANGE_WORLD =
+	{
+		CalledWhen = "Before a entity is changing the world.",
+		DefaultFnName = "OnEntityChangeWorld",  -- also used as pagename
+		Desc = [[
+			This hook is called before the server moves the {{cEntity|entity}} to the given world. Plugins may
+			refuse the changing of the entity to the new world.<p>
+			See also the {{OnEntityChangedWorld|HOOK_ENTITY_CHANGED_WORLD}} hook for a similar hook is called after the
+			entity has been moved to the world.
+		]],
+		Params =
+		{
+			{ Name = "Entity", Type = "{{cEntity}}", Notes = "The entity that wants to change the world" },
+			{ Name = "World", Type = "{{cWorld}}", Notes = "The world to which the entity wants to change" },
+		},
+		Returns = [[
+			If the function returns false or no value, the next plugin's callback is called. If the function
+			returns true, no other callback is called for this event and the change of the entity to the world is
+			cancelled.
+		]],
+	},  -- HOOK_ENTITY_CHANGE_WORLD
+}
+
+
+
+
+
diff --git a/MCServer/Plugins/APIDump/Hooks/OnEntityChangedWorld.lua b/MCServer/Plugins/APIDump/Hooks/OnEntityChangedWorld.lua
new file mode 100644
index 000000000..00645c152
--- /dev/null
+++ b/MCServer/Plugins/APIDump/Hooks/OnEntityChangedWorld.lua
@@ -0,0 +1,28 @@
+return
+{
+	HOOK_ENTITY_CHANGED_WORLD =
+	{
+		CalledWhen = "After a entity has changed the world.",
+		DefaultFnName = "OnEntityChangedWorld",  -- also used as pagename
+		Desc = [[
+			This hook is called after the server has moved the {{cEntity|entity}} to the given world. This is an information-only
+			callback, the entity is already in the new world.<p>
+			See also the {{OnEntityChangeWorld|HOOK_ENTITY_CHANGE_WORLD}} hook for a similar hook called before the
+			entity is moved to the new world.
+		]],
+		Params =
+		{
+			{ Name = "Entity", Type = "{{cEntity}}", Notes = "The entity that has changed the world" },
+			{ Name = "World", Type = "{{cWorld}}", Notes = "The world from which the entity has come" },
+		},
+		Returns = [[
+			If the function returns false or no value, the next plugin's callback is called. If the function
+			returns true, no other callback is called for this event.
+		]],
+	},  -- HOOK_ENTITY_CHANGED_WORLD
+}
+
+
+
+
+
diff --git a/MCServer/Plugins/APIDump/main_APIDump.lua b/MCServer/Plugins/APIDump/main_APIDump.lua
index 4ca06b974..e841922b6 100644
--- a/MCServer/Plugins/APIDump/main_APIDump.lua
+++ b/MCServer/Plugins/APIDump/main_APIDump.lua
@@ -971,7 +971,7 @@ end
 
 --- Writes a list of undocumented objects into a file
 local function ListUndocumentedObjects(API, UndocumentedHooks)
-	f = io.open("API/_undocumented.lua", "w");
+	local f = io.open("API/_undocumented.lua", "w");
 	if (f ~= nil) then
 		f:write("\n-- This is the list of undocumented API objects, automatically generated by APIDump\n\n");
 		f:write("g_APIDesc =\n{\n\tClasses =\n\t{\n");
diff --git a/README.md b/README.md
index 87c4ee93e..43ec942d5 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,14 @@
-MCServer [![Build Status](http://img.shields.io/travis/mc-server/MCServer/master.svg?style=flat)](https://travis-ci.org/mc-server/MCServer) [![Coverity Scan Build Status](https://scan.coverity.com/projects/1930/badge.svg)](https://scan.coverity.com/projects/1930) [![weekly tips](http://img.shields.io/gratipay/cuberite_team.svg?style=flat)](http://gratipay.com/cuberite_team)  [![tip for next commit](http://tip4commit.com/projects/74.svg)](http://tip4commit.com/projects/74)
+MCServer [![Build Status](http://img.shields.io/travis/mc-server/MCServer/master.svg?style=flat)](https://travis-ci.org/mc-server/MCServer) [![Coverity Scan Build Status](https://img.shields.io/coverity/scan/1930.svg)](https://scan.coverity.com/projects/1930) [![weekly tips](http://img.shields.io/gratipay/cuberite_team.svg?style=flat)](http://gratipay.com/cuberite_team)
 ========
 
-MCServer is a Minecraft server that is written in C++ and designed to be efficient with memory and CPU, as well as having a flexible Lua Plugin API.
+MCServer is a Minecraft-compatible multiplayer game server that is written in C++ and designed to be efficient with memory and CPU, as well as having a flexible Lua Plugin API. MCServer is compatible with the vanilla Minecraft client.
 
 MCServer can run on Windows, *nix and Android operating systems. This includes Android phones and tablets as well as Raspberry Pis. 
 
 We currently support Release 1.7 and 1.8 (not beta) Minecraft protocol versions.
 
+Subscribe to [the newsletter](http://newsletter.cuberite.org/subscribe.htm) for important updates and project news.
+
 Installation
 ------------
 Hosted MCServer is available DIY on DigitalOcean: [![Install on DigitalOcean](http://doinstall.bearbin.net/button.svg)](http://doinstall.bearbin.net/install?url=https://github.com/mc-server/MCServer) and [Gamososm](https://gamocosm.com) also offers MCServer support.
@@ -34,9 +36,7 @@ Check out the [CONTRIBUTING.md](https://github.com/mc-server/MCServer/blob/maste
 Other Stuff
 -----------
 
-For other stuff, including plugins and discussion, check the [forums](http://forum.mc-server.org) and [Plugin API](http://mc-server.xoft.cz/LuaAPI/).
-
-Earn bitcoins for commits or donate to reward the MCServer developers: [![tip for next commit](http://tip4commit.com/projects/74.svg)](http://tip4commit.com/projects/74)
+For other stuff, including plugins and discussion, check out the [forums](http://forum.mc-server.org) and [Plugin API](http://mc-server.xoft.cz/LuaAPI/).
 
 Support Us on Gratipay: [![Support via Gratipay](http://img.shields.io/gittip/cuberite_team.svg)](https://www.gratipay.com/cuberite_team)
 
diff --git a/src/Bindings/LuaState.cpp b/src/Bindings/LuaState.cpp
index ccf812417..08c7e19d7 100644
--- a/src/Bindings/LuaState.cpp
+++ b/src/Bindings/LuaState.cpp
@@ -927,6 +927,9 @@ bool cLuaState::CheckParamTable(int a_StartParam, int a_EndParam)
 		VERIFY(lua_getstack(m_LuaState, 0,   &entry));
 		VERIFY(lua_getinfo (m_LuaState, "n", &entry));
 		AString ErrMsg = Printf("#ferror in function '%s'.", (entry.name != nullptr) ? entry.name : "?");
+
+		BreakIntoDebugger(m_LuaState);
+
 		tolua_error(m_LuaState, ErrMsg.c_str(), &tolua_err);
 		return false;
 	}  // for i - Param
@@ -1366,6 +1369,7 @@ int cLuaState::ReportFnCallErrors(lua_State * a_LuaState)
 {
 	LOGWARNING("LUA: %s", lua_tostring(a_LuaState, -1));
 	LogStackTrace(a_LuaState, 1);
+	BreakIntoDebugger(a_LuaState);
 	return 1;  // We left the error message on the stack as the return value
 }
 
@@ -1373,6 +1377,28 @@ int cLuaState::ReportFnCallErrors(lua_State * a_LuaState)
 
 
 
+int cLuaState::BreakIntoDebugger(lua_State * a_LuaState)
+{
+	// Call the BreakIntoDebugger function, if available:
+	lua_getglobal(a_LuaState, "BreakIntoDebugger");
+	if (!lua_isfunction(a_LuaState, -1))
+	{
+		LOGD("LUA: BreakIntoDebugger() not found / not a function");
+		lua_pop(a_LuaState, 1);
+		return 1;
+	}
+	lua_insert(a_LuaState, -2);  // Copy the string that has been passed to us
+	LOGD("Calling BreakIntoDebugger()...");
+	lua_call(a_LuaState, 1, 0);
+	LOGD("Returned from BreakIntoDebugger().");
+
+	return 0;
+}
+
+
+
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // cLuaState::cRef:
 
diff --git a/src/Bindings/LuaState.h b/src/Bindings/LuaState.h
index b38401fd8..5b4ec3ae4 100644
--- a/src/Bindings/LuaState.h
+++ b/src/Bindings/LuaState.h
@@ -389,6 +389,9 @@ protected:
 	
 	/** Used as the error reporting function for function calls */
 	static int ReportFnCallErrors(lua_State * a_LuaState);
+
+	/** Tries to break into the MobDebug debugger, if it is installed. */
+	static int BreakIntoDebugger(lua_State * a_LuaState);
 } ;
 
 
diff --git a/src/Bindings/Plugin.h b/src/Bindings/Plugin.h
index d0c2bcefa..b4bbfd802 100644
--- a/src/Bindings/Plugin.h
+++ b/src/Bindings/Plugin.h
@@ -56,6 +56,8 @@ public:
 	virtual bool OnDisconnect               (cClientHandle & a_Client, const AString & a_Reason) = 0;
 	virtual bool OnEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier) = 0;
 	virtual bool OnEntityTeleport           (cEntity & a_Entity, const Vector3d & a_OldPosition, const Vector3d & a_NewPosition) = 0;
+	virtual bool OnEntityChangeWorld        (cEntity & a_Entity, cWorld & a_World) = 0;
+	virtual bool OnEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World) = 0;
 	virtual bool OnExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, cPluginManager::CommandResult & a_Result) = 0;
 	virtual bool OnExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) = 0;
 	virtual bool OnExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) = 0;
diff --git a/src/Bindings/PluginLua.cpp b/src/Bindings/PluginLua.cpp
index 76d3557a4..a8be26f71 100644
--- a/src/Bindings/PluginLua.cpp
+++ b/src/Bindings/PluginLua.cpp
@@ -534,6 +534,54 @@ bool cPluginLua::OnEntityAddEffect(cEntity & a_Entity, int a_EffectType, int a_E
 
 
 
+bool cPluginLua::OnEntityChangeWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	cCSLock Lock(m_CriticalSection);
+	if (!m_LuaState.IsValid())
+	{
+		return false;
+	}
+	bool res = false;
+	cLuaRefs & Refs = m_HookMap[cPluginManager::HOOK_ENTITY_CHANGE_WORLD];
+	for (cLuaRefs::iterator itr = Refs.begin(), end = Refs.end(); itr != end; ++itr)
+	{
+		m_LuaState.Call((int)(**itr), &a_Entity, &a_World, cLuaState::Return, res);
+		if (res)
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cPluginLua::OnEntityChangedWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	cCSLock Lock(m_CriticalSection);
+	if (!m_LuaState.IsValid())
+	{
+		return false;
+	}
+	bool res = false;
+	cLuaRefs & Refs = m_HookMap[cPluginManager::HOOK_ENTITY_CHANGED_WORLD];
+	for (cLuaRefs::iterator itr = Refs.begin(), end = Refs.end(); itr != end; ++itr)
+	{
+		m_LuaState.Call((int)(**itr), &a_Entity, &a_World, res);
+		if (res)
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
 bool cPluginLua::OnExecuteCommand(cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, cPluginManager::CommandResult & a_Result)
 {
 	cCSLock Lock(m_CriticalSection);
@@ -1884,6 +1932,8 @@ const char * cPluginLua::GetHookFnName(int a_HookType)
 		case cPluginManager::HOOK_DISCONNECT:                   return "OnDisconnect";
 		case cPluginManager::HOOK_PLAYER_ANIMATION:             return "OnPlayerAnimation";
 		case cPluginManager::HOOK_ENTITY_ADD_EFFECT:            return "OnEntityAddEffect";
+		case cPluginManager::HOOK_ENTITY_CHANGE_WORLD:          return "OnEntityChangeWorld";
+		case cPluginManager::HOOK_ENTITY_CHANGED_WORLD:         return "OnEntityChangedWorld";
 		case cPluginManager::HOOK_ENTITY_TELEPORT:              return "OnEntityTeleport";
 		case cPluginManager::HOOK_EXECUTE_COMMAND:              return "OnExecuteCommand";
 		case cPluginManager::HOOK_HANDSHAKE:                    return "OnHandshake";
diff --git a/src/Bindings/PluginLua.h b/src/Bindings/PluginLua.h
index 524c249b0..533dc0331 100644
--- a/src/Bindings/PluginLua.h
+++ b/src/Bindings/PluginLua.h
@@ -115,6 +115,8 @@ public:
 	virtual bool OnCraftingNoRecipe         (cPlayer & a_Player, cCraftingGrid & a_Grid, cCraftingRecipe & a_Recipe) override;
 	virtual bool OnDisconnect               (cClientHandle & a_Client, const AString & a_Reason) override;
 	virtual bool OnEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier) override;
+	virtual bool OnEntityChangeWorld        (cEntity & a_Entity, cWorld & a_World) override;
+	virtual bool OnEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World) override;
 	virtual bool OnExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, cPluginManager::CommandResult & a_Result) override;
 	virtual bool OnExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) override;
 	virtual bool OnExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) override;
diff --git a/src/Bindings/PluginManager.cpp b/src/Bindings/PluginManager.cpp
index 86be30938..6fb6ef4fa 100644
--- a/src/Bindings/PluginManager.cpp
+++ b/src/Bindings/PluginManager.cpp
@@ -525,6 +525,42 @@ bool cPluginManager::CallHookEntityTeleport(cEntity & a_Entity, const Vector3d &
 
 
 
+bool cPluginManager::CallHookEntityChangeWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	FIND_HOOK(HOOK_ENTITY_CHANGE_WORLD);
+	VERIFY_HOOK;
+
+	for (PluginList::iterator itr = Plugins->second.begin(); itr != Plugins->second.end(); ++itr)
+	{
+		if ((*itr)->OnEntityChangeWorld(a_Entity, a_World))
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+bool cPluginManager::CallHookEntityChangedWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	FIND_HOOK(HOOK_ENTITY_CHANGED_WORLD);
+	VERIFY_HOOK;
+
+	for (PluginList::iterator itr = Plugins->second.begin(); itr != Plugins->second.end(); ++itr)
+	{
+		if ((*itr)->OnEntityChangedWorld(a_Entity, a_World))
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
 bool cPluginManager::CallHookExecuteCommand(cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, CommandResult & a_Result)
 {
 	FIND_HOOK(HOOK_EXECUTE_COMMAND);
diff --git a/src/Bindings/PluginManager.h b/src/Bindings/PluginManager.h
index faabf3aec..e528c049f 100644
--- a/src/Bindings/PluginManager.h
+++ b/src/Bindings/PluginManager.h
@@ -86,6 +86,8 @@ public:
 		HOOK_DISCONNECT,
 		HOOK_PLAYER_ANIMATION,
 		HOOK_ENTITY_ADD_EFFECT,
+		HOOK_ENTITY_CHANGE_WORLD,
+		HOOK_ENTITY_CHANGED_WORLD,
 		HOOK_EXECUTE_COMMAND,
 		HOOK_EXPLODED,
 		HOOK_EXPLODING,
@@ -201,6 +203,8 @@ public:
 	bool CallHookDisconnect               (cClientHandle & a_Client, const AString & a_Reason);
 	bool CallHookEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier);
 	bool CallHookEntityTeleport           (cEntity & a_Entity, const Vector3d & a_OldPosition, const Vector3d & a_NewPosition);
+	bool CallHookEntityChangeWorld        (cEntity & a_Entity, cWorld & a_World);
+	bool CallHookEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World);
 	bool CallHookExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, CommandResult & a_Result);  // If a_Player == nullptr, it is a console cmd
 	bool CallHookExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
 	bool CallHookExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
diff --git a/src/Blocks/BlockBed.cpp b/src/Blocks/BlockBed.cpp
index e56f4bfe0..dfa392d9b 100644
--- a/src/Blocks/BlockBed.cpp
+++ b/src/Blocks/BlockBed.cpp
@@ -14,7 +14,7 @@ void cBlockBedHandler::OnDestroyed(cChunkInterface & a_ChunkInterface, cWorldInt
 	NIBBLETYPE OldMeta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
 
 	Vector3i ThisPos( a_BlockX, a_BlockY, a_BlockZ);
-	Vector3i Direction = MetaDataToDirection( OldMeta & 0x7);
+	Vector3i Direction = MetaDataToDirection( OldMeta & 0x3);
 	if (OldMeta & 0x8)
 	{
 		// Was pillow
@@ -111,7 +111,7 @@ void cBlockBedHandler::OnUse(cChunkInterface & a_ChunkInterface, cWorldInterface
 					// Is foot end
 					VERIFY((Meta & 0x4) != 0x4);  // Occupied flag should never be set, else our compilator (intended) is broken
 
-					PillowDirection = MetaDataToDirection(Meta & 0x7);
+					PillowDirection = MetaDataToDirection(Meta & 0x3);
 					if (a_ChunkInterface.GetBlock(a_BlockX + PillowDirection.x, a_BlockY, a_BlockZ + PillowDirection.z) == E_BLOCK_BED)  // Must always use pillow location for sleeping
 					{
 						a_WorldInterface.GetBroadcastManager().BroadcastUseBed(*a_Player, a_BlockX + PillowDirection.x, a_BlockY, a_BlockZ + PillowDirection.z);
diff --git a/src/Blocks/BlockLeaves.h b/src/Blocks/BlockLeaves.h
index bd9a7414e..4d4610fd8 100644
--- a/src/Blocks/BlockLeaves.h
+++ b/src/Blocks/BlockLeaves.h
@@ -40,29 +40,41 @@ public:
 	{
 		cFastRandom rand;
 
-		// Old leaves - 3 bits contain display; new leaves - 1st bit, shifted left two for saplings to understand
-		if (rand.NextInt(6) == 0)
+		// There is a chance to drop a sapling that varies depending on the type of leaf broken.
+		// TODO: Take into account fortune for sapling drops.
+		int chance;
+		if ((m_BlockType == E_BLOCK_LEAVES) && ((a_BlockMeta & 0x03) == E_META_LEAVES_JUNGLE))
+		{
+			// Jungle leaves have a 2.5% chance of dropping a sapling.
+			chance = rand.NextInt(40);
+		}
+		else
+		{
+			// Other leaves have a 5% chance of dropping a sapling.
+			chance = rand.NextInt(20);
+		}
+		if (chance == 0)
 		{
 			a_Pickups.push_back(
 				cItem(
 					E_BLOCK_SAPLING,
 					1,
-					(m_BlockType == E_BLOCK_LEAVES) ? (a_BlockMeta & 0x03) : (2 << (a_BlockMeta & 0x01))
+					(m_BlockType == E_BLOCK_LEAVES) ? (a_BlockMeta & 0x03) : (4 + (a_BlockMeta & 0x01))
 				)
 			);
 		}
-		
-		// 1 % chance of dropping an apple, if the leaves' type is Apple Leaves
+
+		// 0.5 % chance of dropping an apple, if the leaves' type is Apple Leaves
 		if ((m_BlockType == E_BLOCK_LEAVES) && ((a_BlockMeta & 0x03) == E_META_LEAVES_APPLE))
 		{
-			if (rand.NextInt(101) == 0)
+			if (rand.NextInt(200) == 0)
 			{
 				a_Pickups.push_back(cItem(E_ITEM_RED_APPLE, 1, 0));
 			}
 		}
 	}
-	
-	
+
+
 	virtual void OnNeighborChanged(cChunkInterface & a_ChunkInterface, int a_BlockX, int a_BlockY, int a_BlockZ) override
 	{
 		NIBBLETYPE Meta = a_ChunkInterface.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
diff --git a/src/Entities/Entity.cpp b/src/Entities/Entity.cpp
index 4a909a1fd..bc2b3e93e 100644
--- a/src/Entities/Entity.cpp
+++ b/src/Entities/Entity.cpp
@@ -1403,14 +1403,25 @@ bool cEntity::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 		return false;
 	}
 
+	//  Ask the plugins if the entity is allowed to change the world
+	if (cRoot::Get()->GetPluginManager()->CallHookEntityChangeWorld(*this, *a_World))
+	{
+		// A Plugin doesn't allow the entity to change the world
+		return false;
+	}
+
 	// Remove all links to the old world
 	SetWorldTravellingFrom(GetWorld());  // cChunk::Tick() handles entity removal
 	GetWorld()->BroadcastDestroyEntity(*this);
 
 	// Queue add to new world
 	a_World->AddEntity(this);
+	cWorld * OldWorld = cRoot::Get()->GetWorld(GetWorld()->GetName());  // Required for the hook HOOK_ENTITY_CHANGED_WORLD
 	SetWorld(a_World);
 
+	// Entity changed the world, call the hook
+	cRoot::Get()->GetPluginManager()->CallHookEntityChangedWorld(*this, *OldWorld);
+
 	return true;
 }
 
diff --git a/src/Entities/Player.cpp b/src/Entities/Player.cpp
index 607a663de..01ad26297 100644
--- a/src/Entities/Player.cpp
+++ b/src/Entities/Player.cpp
@@ -1606,6 +1606,12 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 		return false;
 	}
 	
+	if (cRoot::Get()->GetPluginManager()->CallHookEntityChangeWorld(*this, *a_World))
+	{
+		// A Plugin doesn't allow the player to change the world
+		return false;
+	}
+
 	// Send the respawn packet:
 	if (a_ShouldSendRespawn && (m_ClientHandle != nullptr))
 	{
@@ -1621,6 +1627,7 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 
 	// Queue adding player to the new world, including all the necessary adjustments to the object
 	a_World->AddPlayer(this);
+	cWorld * OldWorld = cRoot::Get()->GetWorld(GetWorld()->GetName());  // Required for the hook HOOK_ENTITY_CHANGED_WORLD
 	SetWorld(a_World);  // Chunks may be streamed before cWorld::AddPlayer() sets the world to the new value
 
 	// Update the view distance.
@@ -1635,6 +1642,9 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 	// Broadcast the player into the new world.
 	a_World->BroadcastSpawnEntity(*this);
 	
+	// Player changed the world, call the hook
+	cRoot::Get()->GetPluginManager()->CallHookEntityChangedWorld(*this, *OldWorld);
+
 	return true;
 }
 
diff --git a/src/FastRandom.cpp b/src/FastRandom.cpp
index 737b13535..c1716f026 100644
--- a/src/FastRandom.cpp
+++ b/src/FastRandom.cpp
@@ -6,12 +6,28 @@
 #include "Globals.h"
 #include "FastRandom.h"
 
+#include <random>
+
 #ifdef _WIN32
-	#define thread_local __declspec(thread)
+	#define thread_local static __declspec(thread)
+#elif defined __APPLE__
+	#define thread_local static __thread
 #endif
 
-thread_local unsigned int m_Counter = 0;
-
+static unsigned int GetRandomSeed()
+{
+	thread_local bool SeedCounterInitialized = 0;
+	thread_local unsigned int SeedCounter = 0;
+	
+	if (!SeedCounterInitialized)
+	{
+		std::random_device rd;
+		std::uniform_int_distribution<unsigned int> dist;
+		SeedCounter = dist(rd);
+		SeedCounterInitialized = true;
+	}
+	return ++SeedCounter;
+}
 
 
 
@@ -92,7 +108,7 @@ public:
 
 
 cFastRandom::cFastRandom(void) :
-	m_LinearRand(m_Counter++)
+	m_LinearRand(GetRandomSeed())
 {
 }
 
@@ -136,7 +152,7 @@ int cFastRandom::GenerateRandomInteger(int a_Begin, int a_End)
 // MTRand:
 
 MTRand::MTRand() :
-	m_MersenneRand(m_Counter++)
+	m_MersenneRand(GetRandomSeed())
 {
 }
 
diff --git a/src/Mobs/AggressiveMonster.cpp b/src/Mobs/AggressiveMonster.cpp
index d0fb79f6d..055ff47d2 100644
--- a/src/Mobs/AggressiveMonster.cpp
+++ b/src/Mobs/AggressiveMonster.cpp
@@ -36,7 +36,6 @@ void cAggressiveMonster::InStateChasing(std::chrono::milliseconds a_Dt)
 				return;
 			}
 		}
-
 		MoveToPosition(m_Target->GetPosition());
 	}
 }
diff --git a/src/Mobs/Monster.cpp b/src/Mobs/Monster.cpp
index f3f8c6b24..2b00f6959 100644
--- a/src/Mobs/Monster.cpp
+++ b/src/Mobs/Monster.cpp
@@ -89,7 +89,7 @@ cMonster::cMonster(const AString & a_ConfigName, eMonsterType a_MobType, const A
 	, m_SoundDeath(a_SoundDeath)
 	, m_AttackRate(3)
 	, m_AttackDamage(1)
-	, m_AttackRange(2)
+	, m_AttackRange(1)
 	, m_AttackInterval(0)
 	, m_SightDistance(25)
 	, m_DropChanceWeapon(0.085f)
@@ -147,10 +147,15 @@ bool cMonster::TickPathFinding(cChunk & a_Chunk)
 		(Recalculate lots when close, calculate rarely when far) */
 		if (
 			((GetPosition() - m_PathFinderDestination).Length() < 0.25) ||
-			((m_TicksSinceLastPathReset > 10) && (m_TicksSinceLastPathReset > (0.15 * (m_FinalDestination - GetPosition()).SqrLength())))
+			((m_TicksSinceLastPathReset > 10) && (m_TicksSinceLastPathReset > (0.4 * (m_FinalDestination - GetPosition()).SqrLength())))
 		)
 		{
-			ResetPathFinding();
+			/* Re-calculating is expensive when there's no path to target, and it results in mobs freezing very often as a result of always recalculating.
+			This is a workaround till we get better path recalculation. */
+			if (!m_NoPathToTarget)
+			{
+				ResetPathFinding();
+			}
 		}
 	}
 
@@ -161,12 +166,21 @@ bool cMonster::TickPathFinding(cChunk & a_Chunk)
 			StopMovingToPosition();  // Invalid chunks, probably world is loading or something, cancel movement.
 			return false;
 		}
+		m_NoPathToTarget = false;
+		m_NoMoreWayPoints = false;
 		m_PathFinderDestination = m_FinalDestination;
 		m_Path = new cPath(a_Chunk, GetPosition().Floor(), m_PathFinderDestination.Floor(), 20);
 	}
 
 	switch (m_Path->Step(a_Chunk))
 	{
+		case ePathFinderStatus::NEARBY_FOUND:
+		{
+			m_NoPathToTarget = true;
+			m_Path->AcceptNearbyPath();
+			break;
+		}
+
 		case ePathFinderStatus::PATH_NOT_FOUND:
 		{
 			StopMovingToPosition();  // Give up pathfinding to that destination.
@@ -179,15 +193,22 @@ bool cMonster::TickPathFinding(cChunk & a_Chunk)
 		}
 		case ePathFinderStatus::PATH_FOUND:
 		{
-			if (--m_GiveUpCounter == 0)
+			if (m_NoMoreWayPoints || (--m_GiveUpCounter == 0))
 			{
 				ResetPathFinding();  // Try to calculate a path again.
 				return false;
 			}
-			else if (!m_Path->IsLastPoint() && (m_Path->IsFirstPoint() || ReachedNextWaypoint()))  // Have we arrived at the next cell, as denoted by m_NextWayPointPosition?
+			else if (!m_Path->IsLastPoint())  // Have we arrived at the next cell, as denoted by m_NextWayPointPosition?
+			{
+				if ((m_Path->IsFirstPoint() || ReachedNextWaypoint()))
+				{
+					m_NextWayPointPosition = Vector3d(0.5, 0, 0.5) + m_Path->GetNextPoint();
+					m_GiveUpCounter = 40;  // Give up after 40 ticks (2 seconds) if failed to reach m_NextWayPointPosition.
+				}
+			}
+			else
 			{
-				m_NextWayPointPosition = Vector3d(0.5, 0, 0.5) + m_Path->GetNextPoint();
-				m_GiveUpCounter = 40;  // Give up after 40 ticks (2 seconds) if failed to reach m_NextWayPointPosition.
+				m_NoMoreWayPoints = true;
 			}
 			return true;
 		}
@@ -269,21 +290,59 @@ bool cMonster::EnsureProperDestination(cChunk & a_Chunk)
 	{
 		return false;
 	}
-	
+
 	int RelX = FloorC(m_FinalDestination.x) - Chunk->GetPosX() * cChunkDef::Width;
 	int RelZ = FloorC(m_FinalDestination.z) - Chunk->GetPosZ() * cChunkDef::Width;
 
-	// If destination in the air, go down to the lowest air block.
-	while (m_FinalDestination.y > 0)
+	// If destination in the air, first try to go 1 block north, or east, or west.
+	// This fixes the player leaning issue.
+	// If that failed, we instead go down to the lowest air block.
+	Chunk->GetBlockTypeMeta(RelX, FloorC(m_FinalDestination.y) - 1, RelZ, BlockType, BlockMeta);
+	if (!cBlockInfo::IsSolid(BlockType))
 	{
-		Chunk->GetBlockTypeMeta(RelX, FloorC(m_FinalDestination.y) - 1, RelZ, BlockType, BlockMeta);
-		if (cBlockInfo::IsSolid(BlockType))
+		bool InTheAir = true;
+		int x, z;
+		for (z = -1; z <= 1; ++z)
 		{
-			break;
+			for (x = -1; x <= 1; ++x)
+			{
+				if ((x==0) && (z==0))
+				{
+					continue;
+				}
+				Chunk = a_Chunk.GetNeighborChunk(FloorC(m_FinalDestination.x+x), FloorC(m_FinalDestination.z+z));
+				if ((Chunk == nullptr) || !Chunk->IsValid())
+				{
+					return false;
+				}
+				RelX = FloorC(m_FinalDestination.x+x) - Chunk->GetPosX() * cChunkDef::Width;
+				RelZ = FloorC(m_FinalDestination.z+z) - Chunk->GetPosZ() * cChunkDef::Width;
+				Chunk->GetBlockTypeMeta(RelX, FloorC(m_FinalDestination.y) - 1, RelZ, BlockType, BlockMeta);
+				if (cBlockInfo::IsSolid(BlockType))
+				{
+					m_FinalDestination.x += x;
+					m_FinalDestination.z += z;
+					InTheAir = false;
+					goto breakBothLoops;
+				}
+			}
 		}
-		m_FinalDestination.y -= 1;
-	}
+		breakBothLoops:
 
+		// Go down to the lowest air block.
+		if (InTheAir)
+		{
+			while (m_FinalDestination.y > 0)
+			{
+				Chunk->GetBlockTypeMeta(RelX, FloorC(m_FinalDestination.y) - 1, RelZ, BlockType, BlockMeta);
+				if (cBlockInfo::IsSolid(BlockType))
+				{
+					break;
+				}
+				m_FinalDestination.y -= 1;
+			}
+		}
+	}
 
 	// If destination in water, go up to the highest water block.
 	// If destination in solid, go up to first air block.
@@ -447,21 +506,29 @@ void cMonster::SetPitchAndYawFromDestination()
 		}
 	}
 
+
+
+	Vector3d BodyDistance = m_NextWayPointPosition - GetPosition();
+	double BodyRotation, BodyPitch;
+	BodyDistance.Normalize();
+	VectorToEuler(BodyDistance.x, BodyDistance.y, BodyDistance.z, BodyRotation, BodyPitch);
+	SetYaw(BodyRotation);
+
 	Vector3d Distance = FinalDestination - GetPosition();
 	{
-		double Rotation, Pitch;
+		double HeadRotation, HeadPitch;
 		Distance.Normalize();
-		VectorToEuler(Distance.x, Distance.y, Distance.z, Rotation, Pitch);
-		SetHeadYaw(Rotation);
-		SetPitch(-Pitch);
-	}
-
-	{
-		Vector3d BodyDistance = m_NextWayPointPosition - GetPosition();
-		double Rotation, Pitch;
-		BodyDistance.Normalize();
-		VectorToEuler(BodyDistance.x, BodyDistance.y, BodyDistance.z, Rotation, Pitch);
-		SetYaw(Rotation);
+		VectorToEuler(Distance.x, Distance.y, Distance.z, HeadRotation, HeadPitch);
+		if (std::abs(BodyRotation - HeadRotation) < 120)
+		{
+			SetHeadYaw(HeadRotation);
+			SetPitch(-HeadPitch);
+		}
+		else  // We're not an owl. If it's more than 120, don't look behind and instead look at where you're walking.
+		{
+			SetHeadYaw(BodyRotation);
+			SetPitch(-BodyPitch);
+		}
 	}
 }
 
diff --git a/src/Mobs/Monster.h b/src/Mobs/Monster.h
index 5d20ba810..c4043b0e5 100644
--- a/src/Mobs/Monster.h
+++ b/src/Mobs/Monster.h
@@ -180,6 +180,13 @@ protected:
 	/** Coordinates for the ultimate, final destination last given to the pathfinder. */
 	Vector3d m_PathFinderDestination;
 
+	/** True if there's no path to target and we're walking to an approximated location. */
+	bool m_NoPathToTarget;
+
+	/** Whether The mob has finished their path, note that this does not imply reaching the destination,
+	the destination may sometimes differ from the current path. */
+	bool m_NoMoreWayPoints;
+
 	/** Finds the lowest non-air block position (not the highest, as cWorld::GetHeight does)
 	If current Y is nonsolid, goes down to try to find a solid block, then returns that + 1
 	If current Y is solid, goes up to find first nonsolid block, and returns that.
diff --git a/src/Mobs/Path.cpp b/src/Mobs/Path.cpp
index ba7d615ae..ba8046a2b 100644
--- a/src/Mobs/Path.cpp
+++ b/src/Mobs/Path.cpp
@@ -8,7 +8,7 @@
 
 #define DISTANCE_MANHATTAN 0  // 1: More speed, a bit less accuracy 0: Max accuracy, less speed.
 #define HEURISTICS_ONLY 0  // 1: Much more speed, much less accurate.
-#define CALCULATIONS_PER_STEP 5  // Higher means more CPU load but faster path calculations.
+#define CALCULATIONS_PER_STEP 10  // Higher means more CPU load but faster path calculations.
 // The only version which guarantees the shortest path is 0, 0.
 
 enum class eCellStatus {OPENLIST,  CLOSEDLIST,  NOLIST};
@@ -44,7 +44,8 @@ cPath::cPath(
 	m_Destination(a_EndingPoint.Floor()),
 	m_Source(a_StartingPoint.Floor()),
 	m_CurrentPoint(0),  // GetNextPoint increments this to 1, but that's fine, since the first cell is always a_StartingPoint
-	m_Chunk(&a_Chunk)
+	m_Chunk(&a_Chunk),
+	m_BadChunkFound(false)
 {
 	// TODO: if src not walkable OR dest not walkable, then abort.
 	// Borrow a new "isWalkable" from ProcessIfWalkable, make ProcessIfWalkable also call isWalkable
@@ -55,6 +56,7 @@ cPath::cPath(
 		return;
 	}
 
+	m_NearestPointToTarget = GetCell(m_Source);
 	m_Status = ePathFinderStatus::CALCULATING;
 	m_StepsLeft = a_MaxSteps;
 
@@ -81,15 +83,20 @@ cPath::~cPath()
 ePathFinderStatus cPath::Step(cChunk & a_Chunk)
 {
 	m_Chunk = &a_Chunk;
-
 	if (m_Status != ePathFinderStatus::CALCULATING)
 	{
 		return m_Status;
 	}
 
-	if (m_StepsLeft == 0)
+	if (m_BadChunkFound)
 	{
 		FinishCalculation(ePathFinderStatus::PATH_NOT_FOUND);
+		return m_Status;
+	}
+
+	if (m_StepsLeft == 0)
+	{
+		AttemptToFindAlternative();
 	}
 	else
 	{
@@ -102,9 +109,9 @@ ePathFinderStatus cPath::Step(cChunk & a_Chunk)
 				break;  // if we're here, m_Status must have changed either to PATH_FOUND or PATH_NOT_FOUND.
 			}
 		}
-	}
 
-	m_Chunk = nullptr;
+		m_Chunk = nullptr;
+	}
 	return m_Status;
 }
 
@@ -112,6 +119,17 @@ ePathFinderStatus cPath::Step(cChunk & a_Chunk)
 
 
 
+Vector3i cPath::AcceptNearbyPath()
+{
+	ASSERT(m_Status == ePathFinderStatus::NEARBY_FOUND);
+	m_Status = ePathFinderStatus::PATH_FOUND;
+	return m_Destination;
+}
+
+
+
+
+
 bool cPath::IsSolid(const Vector3i & a_Location)
 {
 	ASSERT(m_Chunk != nullptr);
@@ -119,6 +137,7 @@ bool cPath::IsSolid(const Vector3i & a_Location)
 	auto Chunk = m_Chunk->GetNeighborChunk(a_Location.x, a_Location.z);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
+		m_BadChunkFound = true;
 		return true;
 	}
 	m_Chunk = Chunk;
@@ -149,34 +168,29 @@ bool cPath::Step_Internal()
 {
 	cPathCell * CurrentCell = OpenListPop();
 
-	// Path not reachable, open list exauhsted.
+	// Path not reachable.
 	if (CurrentCell == nullptr)
 	{
-		FinishCalculation(ePathFinderStatus::PATH_NOT_FOUND);
-		ASSERT(m_Status == ePathFinderStatus::PATH_NOT_FOUND);
+		AttemptToFindAlternative();
 		return true;
 	}
 
 	// Path found.
-	if (
-			(CurrentCell->m_Location == m_Destination + Vector3i(0, 0, 1)) ||
-			(CurrentCell->m_Location == m_Destination + Vector3i(1, 0, 0)) ||
-			(CurrentCell->m_Location == m_Destination + Vector3i(-1, 0, 0)) ||
-			(CurrentCell->m_Location == m_Destination + Vector3i(0, 0, -1)) ||
-			(CurrentCell->m_Location == m_Destination + Vector3i(0, -1, 0))
-	)
+	if (CurrentCell->m_Location == m_Destination)
 	{
-		do
-		{
-			m_PathPoints.push_back(CurrentCell->m_Location);  // Populate the cPath with points.
-			CurrentCell = CurrentCell->m_Parent;
-		} while (CurrentCell != nullptr);
-
+		BuildPath();
 		FinishCalculation(ePathFinderStatus::PATH_FOUND);
 		return true;
 	}
 
-	// Calculation not finished yet, process a currentCell by inspecting all neighbors.
+	// Calculation not finished yet.
+	// Check if we have a new NearestPoint.
+	if (CurrentCell->m_H < m_NearestPointToTarget->m_H)
+	{
+		m_NearestPointToTarget = CurrentCell;
+	}
+
+	// process a currentCell by inspecting all neighbors.
 
 	// Check North, South, East, West on all 3 different heights.
 	int i;
@@ -213,13 +227,40 @@ bool cPath::Step_Internal()
 
 
 
-void cPath::FinishCalculation()
+void cPath::AttemptToFindAlternative()
 {
-	for (auto && pair : m_Map)
+	if (m_NearestPointToTarget == GetCell(m_Source))
+	{
+		FinishCalculation(ePathFinderStatus::PATH_NOT_FOUND);
+	}
+	else
 	{
-		delete pair.second;
+		m_Destination = m_NearestPointToTarget->m_Location;
+		BuildPath();
+		FinishCalculation(ePathFinderStatus::NEARBY_FOUND);
 	}
+}
+
+
+
+
+
+void cPath::BuildPath()
+{
+	cPathCell * CurrentCell = GetCell(m_Destination);
+	do
+	{
+		m_PathPoints.push_back(CurrentCell->m_Location);  // Populate the cPath with points.
+		CurrentCell = CurrentCell->m_Parent;
+	} while (CurrentCell != nullptr);
+}
+
+
+
 
+
+void cPath::FinishCalculation()
+{
 	m_Map.clear();
 	m_OpenList = std::priority_queue<cPathCell *, std::vector<cPathCell *>, compareHeuristics>{};
 }
@@ -230,6 +271,10 @@ void cPath::FinishCalculation()
 
 void cPath::FinishCalculation(ePathFinderStatus a_NewStatus)
 {
+	if (m_BadChunkFound)
+	{
+		a_NewStatus = ePathFinderStatus::PATH_NOT_FOUND;
+	}
 	m_Status = a_NewStatus;
 	FinishCalculation();
 }
@@ -255,7 +300,7 @@ cPathCell * cPath::OpenListPop()  // Popping from the open list also means addin
 {
 	if (m_OpenList.size() == 0)
 	{
-		return nullptr;  // We've exhausted the search space and nothing was found, this will trigger a PATH_NOT_FOUND status.
+		return nullptr;  // We've exhausted the search space and nothing was found, this will trigger a PATH_NOT_FOUND or NEARBY_FOUND status.
 	}
 
 	cPathCell * Ret = m_OpenList.top();
@@ -348,7 +393,7 @@ cPathCell * cPath::GetCell(const Vector3i & a_Location)
 	{
 		Cell = new cPathCell();
 		Cell->m_Location = a_Location;
-		m_Map[a_Location] = Cell;
+		m_Map[a_Location] = UniquePtr<cPathCell>(Cell);
 		Cell->m_IsSolid = IsSolid(a_Location);
 		Cell->m_Status = eCellStatus::NOLIST;
 		#ifdef COMPILING_PATHFIND_DEBUGGER
@@ -360,6 +405,6 @@ cPathCell * cPath::GetCell(const Vector3i & a_Location)
 	}
 	else
 	{
-		return m_Map[a_Location];
+		return m_Map[a_Location].get();
 	}
 }
diff --git a/src/Mobs/Path.h b/src/Mobs/Path.h
index adae77984..7a4182f17 100644
--- a/src/Mobs/Path.h
+++ b/src/Mobs/Path.h
@@ -23,7 +23,7 @@ Put this in your .cpp:
 class cChunk;
 
 /* Various little structs and classes */
-enum class ePathFinderStatus {CALCULATING,  PATH_FOUND,  PATH_NOT_FOUND};
+enum class ePathFinderStatus {CALCULATING,  PATH_FOUND,  PATH_NOT_FOUND, NEARBY_FOUND};
 struct cPathCell;  // Defined inside Path.cpp
 class compareHeuristics
 {
@@ -62,9 +62,17 @@ public:
 	/** Destroys the path and frees its memory. */
 	~cPath();
 
-	/** Performs part of the path calculation and returns true if the path computation has finished. */
+	/** Performs part of the path calculation and returns the appropriate status.
+	If NEARBY_FOUND is returned, it means that the destination is not reachable, but a nearby destination
+	is reachable. If the user likes the alternative destination, they can call AcceptNearbyPath to treat the path as found,
+	and to make consequent calls to step return PATH_FOUND*/
 	ePathFinderStatus Step(cChunk & a_Chunk);
 
+	/** Called after the PathFinder's step returns NEARBY_FOUND.
+	Changes the PathFinder status from NEARBY_FOUND to PATH_FOUND, returns the nearby destination that
+	the PathFinder found a path to. */
+	Vector3i AcceptNearbyPath();
+
 	/* Point retrieval functions, inlined for performance. */
 	/** Returns the next point in the path. */
 	inline Vector3i GetNextPoint()
@@ -93,7 +101,10 @@ public:
 	/** Returns the total number of points this path has. */
 	inline int GetPointCount()
 	{
-		ASSERT(m_Status == ePathFinderStatus::PATH_FOUND);
+		if (m_Status != ePathFinderStatus::PATH_FOUND)
+		{
+			return 0;
+		}
 		return m_PathPoints.size();
 	}
 
@@ -119,6 +130,8 @@ private:
 	bool Step_Internal();  // The public version just calls this version * CALCULATIONS_PER_CALL times.
 	void FinishCalculation();  // Clears the memory used for calculating the path.
 	void FinishCalculation(ePathFinderStatus a_NewStatus);  // Clears the memory used for calculating the path and changes the status.
+	void AttemptToFindAlternative();
+	void BuildPath();
 
 	/* Openlist and closedlist management */
 	void OpenListAdd(cPathCell * a_Cell);
@@ -131,10 +144,11 @@ private:
 
 	/* Pathfinding fields */
 	std::priority_queue<cPathCell *,  std::vector<cPathCell *>,  compareHeuristics> m_OpenList;
-	std::unordered_map<Vector3i,  cPathCell *, VectorHasher> m_Map;
+	std::unordered_map<Vector3i,  UniquePtr<cPathCell>, VectorHasher> m_Map;
 	Vector3i m_Destination;
 	Vector3i m_Source;
 	int m_StepsLeft;
+	cPathCell * m_NearestPointToTarget;
 
 	/* Control fields */
 	ePathFinderStatus m_Status;
@@ -145,6 +159,7 @@ private:
 
 	/* Interfacing with the world */
 	cChunk * m_Chunk;  // Only valid inside Step()!
+	bool m_BadChunkFound;
 	#ifdef COMPILING_PATHFIND_DEBUGGER
 	#include "../path_irrlicht.cpp"
 	#endif
diff --git a/src/Protocol/Protocol18x.cpp b/src/Protocol/Protocol18x.cpp
index 17faca27e..4612af4a5 100644
--- a/src/Protocol/Protocol18x.cpp
+++ b/src/Protocol/Protocol18x.cpp
@@ -51,7 +51,7 @@ Implements the 1.8.x protocol classes:
 
 
 /** The slot number that the client uses to indicate "outside the window". */
-static const Int16 SLOT_NUM_OUTSIDE = -1;
+static const Int16 SLOT_NUM_OUTSIDE = -999;
 
 
 
@@ -2265,7 +2265,7 @@ void cProtocol180::HandlePacketCreativeInventoryAction(cByteBuffer & a_ByteBuffe
 	{
 		return;
 	}
-	m_Client->HandleCreativeInventory(SlotNum, Item, (SlotNum == SLOT_NUM_OUTSIDE) ? caLeftClickOutside : caLeftClick);
+	m_Client->HandleCreativeInventory(SlotNum, Item, (SlotNum == -1) ? caLeftClickOutside : caLeftClick);
 }
 
 
diff --git a/src/World.cpp b/src/World.cpp
index eb8835467..e93d6bb26 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -800,7 +800,7 @@ void cWorld::InitialiseGeneratorDefaults(cIniFile & a_IniFile)
 			a_IniFile.GetValueSet("Generator", "BiomeGen",       "Grown");
 			a_IniFile.GetValueSet("Generator", "ShapeGen",       "BiomalNoise3D");
 			a_IniFile.GetValueSet("Generator", "CompositionGen", "Biomal");
-			a_IniFile.GetValueSet("Generator", "Finishers",      "Ravines, WormNestCaves, WaterLakes, WaterSprings, LavaLakes, LavaSprings, OreNests, Mineshafts, Trees, Villages, SprinkleFoliage, Ice, Snow, Lilypads, BottomLava, DeadBushes, NaturalPatches, PreSimulator, Animals");
+			a_IniFile.GetValueSet("Generator", "Finishers",      "RoughRavines, WormNestCaves, WaterLakes, WaterSprings, LavaLakes, LavaSprings, OreNests, Mineshafts, Trees, Villages, TallGrass, SprinkleFoliage, Ice, Snow, Lilypads, BottomLava, DeadBushes, NaturalPatches, PreSimulator, Animals");
 			break;
 		}
 		case dimNether: